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node_modules/fs-extra/lib/fs/index.js

@@ -1,3 +1,4 @@
+'use strict'
 // This is adapted from https://github.com/normalize/mz
 // Copyright (c) 2014-2016 Jonathan Ong me@jongleberry.com and Contributors
 const u = require('universalify').fromCallback
@@ -9,6 +10,7 @@ const api = [
   'chmod',
   'chown',
   'close',
+  'copyFile',
   'fchmod',
   'fchown',
   'fdatasync',
@@ -17,11 +19,12 @@ const api = [
   'ftruncate',
   'futimes',
   'lchown',
+  'lchmod',
   'link',
   'lstat',
   'mkdir',
+  'mkdtemp',
   'open',
-  'read',
   'readFile',
   'readdir',
   'readlink',
@@ -33,14 +36,22 @@ const api = [
   'truncate',
   'unlink',
   'utimes',
-  'write',
   'writeFile'
-]
-// fs.mkdtemp() was added in Node.js v5.10.0, so check if it exists
-typeof fs.mkdtemp === 'function' && api.push('mkdtemp')
+].filter(key => {
+  // Some commands are not available on some systems. Ex:
+  // fs.copyFile was added in Node.js v8.5.0
+  // fs.mkdtemp was added in Node.js v5.10.0
+  // fs.lchown is not available on at least some Linux
+  return typeof fs[key] === 'function'
+})
 
 // Export all keys:
 Object.keys(fs).forEach(key => {
+  if (key === 'promises') {
+    // fs.promises is a getter property that triggers ExperimentalWarning
+    // Don't re-export it here, the getter is defined in "lib/index.js"
+    return
+  }
   exports[key] = fs[key]
 })
 
@@ -59,3 +70,35 @@ exports.exists = function (filename, callback) {
     return fs.exists(filename, resolve)
   })
 }
+
+// fs.read() & fs.write need special treatment due to multiple callback args
+
+exports.read = function (fd, buffer, offset, length, position, callback) {
+  if (typeof callback === 'function') {
+    return fs.read(fd, buffer, offset, length, position, callback)
+  }
+  return new Promise((resolve, reject) => {
+    fs.read(fd, buffer, offset, length, position, (err, bytesRead, buffer) => {
+      if (err) return reject(err)
+      resolve({ bytesRead, buffer })
+    })
+  })
+}
+
+// Function signature can be
+// fs.write(fd, buffer[, offset[, length[, position]]], callback)
+// OR
+// fs.write(fd, string[, position[, encoding]], callback)
+// We need to handle both cases, so we use ...args
+exports.write = function (fd, buffer, ...args) {
+  if (typeof args[args.length - 1] === 'function') {
+    return fs.write(fd, buffer, ...args)
+  }
+
+  return new Promise((resolve, reject) => {
+    fs.write(fd, buffer, ...args, (err, bytesWritten, buffer) => {
+      if (err) return reject(err)
+      resolve({ bytesWritten, buffer })
+    })
+  })
+}